Audi A3 / S3 / RS3 A3 / S3 / RS3 8P (2003 - 2012) Rear Diff Front Mounting Bush 30mm - PFR85-523 This bush fits models only where the bush location in the diff casing measures 30mm tall as found on AWD 2004-2015 PQ35 platform vehicles. If in doubt, measure the height of the front casing mount before ordering. If the mount is 35mm in height and the OEM part number on your vehicle is 1K0 599 437, please use PFR85-524. - NOTE: Price is for CAR KIT, NOT per bush… Powerflex price their bushes individually, but we have combined the quantities to make it simple!